Need a "short list" of best Subwoofers for M.L.'s


Hello out there!

I'm looking for the best possible brand, size, etc. of subwoofer that would be the best "blend" to augment my Martin Logan Odyssey's. (Let's keep it to the "powered" category for simplicity's sake :)

Thanks to any & all!
denf
I'm using two Velodyne HGS-15 subs with my M.L. Odyssey's and I could not be more please with the results.
I have tried a lot & sold them all until I got an REL Stadium II. After adjusment it blends perfectly with my Quest Z's.
Look for something with a nice low system Q (no higher than 1, preferably .5) well-damped, with a tank-like cabinet-that'll give you that subjectively 'fast' bass.
I would say the Ml Descent. I love the way it sounds with my Requests. I am going to buy another one for my surround system I am so happy with the match.
Try to audition the Descent. I purchased one, now I use two, ML Descents and they provide really tight bass.